<template>
  <div class="cart">
    <order-header title="我的购物车">
      <template v-slot:tip>
        <span class="tips">温馨提示： 产品最终下单是否成功，以最终结算为准哦，请尽快结算</span>
      </template>
    </order-header>
    <div class="wrapper">
      <div class="container">
        <div class="cart-box">
          <ul class="cart-item-head">
            <li class="col-1">
              <span
                class="checkbox"
                v-bind:class="{'checked':allChecked}"
                @click="toggleAll">
              </span>全选
            </li>
            <li class="col-3">商品名称</li>
            <li class="col-1">单价</li>
            <li class="col-2">数量</li>
            <li class="col-1">小计</li>
            <li class="col-1">操作</li>
          </ul>
          <ul class="cart-item-list">
            <li
              class="cart-item"
              v-for="item in cartList"
              :key="item.id"
            >
              <div class="item-check">
                <span
                  class="checkbox"
                  :class="{'checked': item.productSelected}"
                  @click="updateCart(item)"
                ></span>
              </div>
              <div class="item-name">
                <img v-lazy="item.productMainImage" :alt="item.productName">
                <span>{{item.productName}}</span>
              </div>
              <div class="item-price">{{item.productPrice}}</div>
              <div class="item-num">
                <div class="num-box">
                  <a href="javascript:;" @click="updateCart(item, '-')">-</a>
                  <span>{{item.quantity}}</span>
                  <a href="javascript:;" @click="updateCart(item, '+')">+</a>
                </div>
              </div>
              <div class="item-total">{{item.productTotalPrice}}</div>
              <div class="item-del" @click="delProduct(item)"></div>
            </li>
          </ul>
        </div>
        <div class="order-wrap clearfix">
          <div class="cart-tip fl">
            <a href="/">继续购物</a>
            共<span>{{cartTotalQuantity}}</span>件商品，已选择<span>{{checkedNum}}</span>件
          </div>
          <div class="total fr">
            合计：<span>{{cartTotalPrice}}</span>元
            <a href="javascript:;" class="btn" @click="order">去结算</a>
          </div>
        </div>
      </div>
    </div>
    <service-bar></service-bar>
    <nav-footer></nav-footer>
  </div>
</template>

<script>
  import { 
    cartList,
    putProduct,
    deleteProduct
  } from './../../util/request.js'
  import OrderHeader from './../../components/OrderHeader.vue'
  import ServiceBar from './../../components/ServiceBar'
  import NavFooter from '../../components/NavFooter.vue'
  export default {
    name: 'cart',
    
    components: {
      OrderHeader,
      NavFooter,
      ServiceBar
    },
    data(){
      return {
        //  购物车列表
        cartList: [],
        allChecked: false,
        cartTotalPrice: 0,
        // 商品的选择量
        checkedNum: 0,
        // 商品的总数量
        cartTotalQuantity: 0
      }
    },
    mounted() {
      this.getCartList()
    },
    methods:{
      // 获取购物车
      getCartList() {
        cartList().then(res => {
          console.log(res)
          this.renderData(res)
        })
      },
      // 购物车下单
      order(){
        this.$router.push('/order/confirm');
      },
      // 控制全选非全选状态
      toggleAll(){
        let path = this.allChecked ? '/carts/unSelectAll' : '/carts/selectAll'
        this.$http.put(path).then(res => {
          this.renderData(res)
        })
      },
      // 更新购物车数量和单选状态
      updateCart(item, type) {
        let quantity = item.quantity
        let selected = item.productSelected
        if (type === '-') {
          if (quantity <= 1) {
            this.$message.error('商品数量最少为1，删除商品请点击×号删除')
            return
          }
          --quantity
        } else if (type === '+') {
          if (quantity > item.productStock) {
            this.$message.error('当前为最大库存')
            return
          }
          ++quantity
        } else {
          selected = !item.productSelected
        }
        putProduct(item.productId,{quantity,selected}).then(res => {
          this.renderData(res)
        })
      },
      // 购物车删除商品
      delProduct(item) {
        deleteProduct(item.productId).then( res => {
          this.$message.warning('商品已移除')
          this.renderData(res)
        })
      },
      // 封装数据赋值函数
      renderData(res) {
        // console.log(res)
        this.cartList = res.cartProductVoList || []
        this.allChecked = res.selectedAll
        this.cartTotalPrice = res.cartTotalPrice
        this.cartTotalQuantity = res.cartTotalQuantity
        this.checkedNum = this.cartList.filter(item => item.productSelected).length
      },
      order() {
        let isChecked = this.cartList.every(item => !item.productSelected)
        if (isChecked) {
          this.$message.warning('请选择至少一件商品')
        } else {
          this.$router.push('/order/confirm')
        }
      }
    }
  }
</script>

<style lang='scss'>
@import './../../assets/scss/config.scss';
@import './../../assets/scss/mixin.scss';
@import './../../assets/scss/button.scss';
.cart{
   .wrapper{
      background-color:#F5F5F5;
      padding-top:30px;
      padding-bottom:114px;
      .cart-box{
        background-color:#fff;
        font-size:14px;
        color:#999999;
        text-align:center;
        .checkbox{
          display: inline-block;
          width: 22px;
          height: 22px;
          border: 1px solid #E5E5E5;
          vertical-align: middle;
          margin-right: 17px;
          cursor:pointer;
          &.checked{
            background:url('/imgs/icon-gou.png') #FF6600 no-repeat center;
            background-size:16px 12px;
            border:none;
          }
        }
        .cart-item-head{
          display:flex;
          height: 79px;
          line-height: 79px;
          .col-1{
            flex:1;
          }
          .col-2{
            flex:2;
          }
          .col-3{
            flex:3;
          }
        }
        .cart-item-list{
          .cart-item{
            display:flex;
            align-items:center;
            height:125px;
            border-top:1px solid #E5E5E5;
            font-size:16px;
            .item-check{
              flex:1;
            }
            .item-name{
              flex:3;
              font-size: 18px;
              color: #333333;
              display: flex;
              align-items: center;
              img{
                width:80px;
                height:80px;
                vertical-align:middle;
              }
              span{
                margin-left: 30px;
              }
            }
            .item-price{
              flex:1;
              color:#333333;
            }
            .item-num{
              flex:2;
              .num-box{
                display:inline-block;
                width:150px;
                height:40px;
                line-height:40px;
                border:1px solid #E5E5E5;
                font-size:14px;
                a{
                  display:inline-block;
                  width:50px;
                  color:#333333;
                }
                span{
                  display:inline-block;
                  width:50px;
                  color:#333333;
                }
              }
            }
            .item-total{
              flex:1;
              color:#FF6600;
            }
            .item-del{
              flex:1;
              width:14px;
              height:12px;
              background:url('/imgs/icon-close.png') no-repeat center;
              background-size:contain;
              cursor:pointer;
            }
          }
        }
      }
      .order-wrap{
        font-size:14px;
        color: #666666;
        margin-top: 20px;
        height: 50px;
        line-height: 50px;
        .cart-tip{
          margin-left: 29px;
          a{
            color: #666666;
            margin-right:37px;
          }
          span{
            color:#FF6600;
            margin:0 5px;
          }
        }
        .total{
          font-size:14px;
          color:#FF6600;
          span{
            font-size:24px;
          }
          a{
            width:202px;
            height:50px;
            line-height:50px;
            font-size:18px;
            margin-left:37px;
          }
        }
      }
    }
}

</style>